Cats are better than dogs.
a) stink ( I know you're thinking "MY dog doesn't stink" and guess what... you're wrong)
b) eat poop and lick your mouth
c) are only cute when they are puppies, with some exceptions (your shitzu is not the exception)
I came across a little video on YouTube that you may enjoy:
An Engineer's Guide to Cats
It's about cats and it's made by engineers. They are smart so they know what they're talking about.